Safety-appliance for elevators.



W. L. FINNE. SAFETY APPLIANCE FOR ELEVATORS.

- APPLICATION FILED JUNE l2I 1911.

1,244,723. Patented 0% 30.1917.

2 suns-sum n.

To all whom it may concern:

ILLIAM nrrivnnor nmzaisnrrrnnw "JERSEY;

' sarnrrnrrrrancn roaannnvaroas Be a knownthat I, wlmm' tame, a

citizen .of the United State s, residing at Elizabeth, in the county of Unionand State of New Jersey, have invented certain new and useful.improvements in .Safety Appli- 'ances for Elevators,; of which the following .13 a full, clear, and exact spec fication.

This inventionrelates to safety means for preventing persons from becoming hurtfby being I accidentally caught between the I floor of the elevator carvand the topof. the doo-r leading to the shaft, or between thetop of the car and the landing.

It is-the aim of the invention toprovide improved meansfor automatically. breaking the circuit to'themotor-and controller of an electrically operated elevator, and. also applying the brake, whenever any, obstruction :is placed betweenlthe floor of the car andtop of the door leading to the shaft or between the top of the entrance to the. car and the landing. Other objects will appear as the description proceeds. v

The invention will be first hereinafter described in connection with the. accompanydesignate corresponding parts throughout.

the several views: V

Figure 1 is a diagrammatic view of a portion of an elevator shaft with a plurality of doors leading thereto, a car, and electric controlling mechanism for the same, said mechanism being illustrated in normal position as when the circuit to the motor and controller is closed and the brake is not applied, and

Fig. 2 is a detail of one end of one of the safety bars, showing on a larger scale the means for supporting it and the switch or circuit breaker which it controls.

Fig. 3 is a section on the line III-III of Fig. 2.

It will be understood that the elevator shaft 1 may be of any length and be provided with any dem'red number of entrance doors 2 from different floors The car 3 is equipped with the usual controller d from which one wire 5 runs to one of a pair of circuit breakers 6 mounted adjacent to each of the openings or doors 2 leading to the ofthecar.

I Specificati'on of Letters Eatent; f-j jPatgntgd bqjt 3O5191'P. Application filed me 12, 1917., Seria1No 17 43 82.

shaft. wit-r sin run from the main swear Erom ithe controller 1 another wire 22 leads to the switch board 15, where it may be placedin circuit withione of the wires 14 running to the main swit'chv 12. Another wire 2l leads from the controller fto one "of a pair of circuit breakers19-1nountedat opposite lsides of ithe entrance, to ;the ear .3. Frompneofr the main feed wires 13, the

'12 to a switchboard 15, and from said switch board wires 16, run to the motor 17 which operates the car ;3 bymeans of a cable indi- Mcatedin broken lines at- 23 aspassingfo ver asheave 24 and connected'at25 t0 theftop,

11 runs direct to the I magnet 10, energizing I same on being connected up with the wire 9, which runs-in series withfthe circuitlbr eakersfi oneachside ofthe landing doors and continues in series through the wire s 7, Sand 5, through the contrlleriWithoutinterruption, thence througlythe wire 21 connectedin series with the circuitbreakers 19, through the wires :20, and back to another one of the main feed wires 13 through the wire 18 making. a completecircuit which will:;only be interrupted when an accident happens causing movement, of any one of the circuit breakers v6 or 19 from its normal closed position, Such movement of any one of the circuit breakers 6 or 19 will interrupt the circuit to the motor and controller through demagnetization of the magnet 10 and consequent opening of the switch 12, whereupon the armature 41 thereof will be released and in moving downward will swing the lever 43 so as to open the main switch through the connection 15 between said switch and the lever 43, and tighten the brake band 46 thus stopping the car.

Each circuit breaker 6 and 19 comprises two spaced contact plates 38 and 39 suitably mounted in a protecting casing or box 40, as best shown in Fig. 2. These contact plates are normally bridged by a V-shaped member 37 carried at each end of a bar 26, one of which is arranged across the entrance to the elevator car near its top, and across the entrance or door leading to the shaft on each landing also near the top of said entrance or door. downwardly bent end portions 27 clamped in brackets 28 which are mounted to slide c vertically on a rod 30 extending between brackets 32 suitably fastened to the shaft or car as thecase may be by bolts 33. A coiled Each of these bars has spring. 341 is mounted around the rod 30,

above the upper one of the brackets 28 for yieldingly holding the bar 26 down with the V-shaped member in position to bridge the vator car and the top of any one of the entrances or doors 2 to the elevator shaft when the car is moving upward, the safety cross bar 26 will be raised, its vertically bent end portions sliding upward on the rods 30 against the action of the springs 34, and the bridging members 37 separated from the contact plates 38 and 89, thereby interrupting the circuit to the magnet 10, and instantly stopping the car by applying the brake as already described. The operation will be the same should an obstruction be presented between the top of the entrance to the elevator car and the floor of a landing when the car is moving downward. y Having thus described my invention, what "Iclaim as new anddesire to secure by LettersPatent of the United States is 1. The combination with an elevator shaft Copies of this patent may be obtained for having ,a door opening, of an elevator car to move in said shaft, a circuit for controlling said car, a' vertically movable bar arranged a cross the entrance to said car and .having vertically turned ends, brackets secured to said ends, vertical rods fastened to the car and on which said brackets are 40 mounted to slide, a circuit breaker comprising two spaced contact plates in said carcontrolling circuit, a bridging element car ried by the end of the bar, and a spring coiled about one of the vertical rods for *yieldingly holding said bridging element in contact with said contact plates.

2. The combination with an elevator shaft having a door opening, of an elevator car to move in said shaft, a circuit for controlling said car, a vertically movable bar arranged across the entrance to the car and having vertically bent ends, brackets secured to said ends, vertical rods fastened to the car and on which said brackets are mounted to slide, a circuit breaker comprising two spaced contact plates in said carcontrolling circuit, a bridging membercarried' by one end of the bar, means for yieldin l 'holdin said brid in member in conb y b b tact with said contact plates, and a bumper. spring coiled around said rod below said brackets. y

'In testimony whereof I have signed my name to this specification. I i

WILLIAM L. FINNE.

five cents each; by addressing the Commissioner of Patents. Washington, D. G. 

